General dentist evaluate the tooth and see if he/she can do the root canal.

If the root canal looks too complex they may send the patient to a endodontist. The endodontist spercializes in root canals and is especially good at complex procedures. Last the dentist for whatever reason may not feel comfortable with doing the root canal.
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Depends on the emergency, if you suspect you have a cavity, keep the area clean and possible use temp fill or dental wax found at drug stores etc.

If you are swollen i would suggest an emergency room, if you cannot get help from a dentist. I would caution that emergency rooms are not prepared to do much more than give you a prescription, however that might be just what you need.
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Orajel is quite safe, but not terribly powerful medicine to help with pain.

It won't hurt to try it. You are already on antibiotic and so should be ok. You can consider adding motrin/aleve. Also, consult your doc/dentist to see if it is appropriate to increase your pain medicine i.e. Taking two tylenol/codeine at once may provide better pain control. Good luck.
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